Improvement in saw-gumming machines



R. DENSMORE.

SAW-GUMMING MACHINE.

No.175,594. Patented Apri14,1 876 WITNESSES N. PETERS. PHOTQ-LITMOGMPHER. WASHINGTON. u C.

. urrtm STATES RANDOLPH DENSMOBE, OF GRAND RAPIDS, MICHIGAN.

IMPROVEMENT lN SAW-GUMMING MACHINES.

Specification forming part of Letters Patent No. H 75,59 fl, dated April 4, 1876 appli t filed July 22, 1875. c

- reference marked thereon, making a part of this specification.

The nature of my invention consists in the construction and arrangement of a saw-gumming machine, as will be hereinafter more fully set forth.

In the drawings, Figure 1 represents a perspective view of my improved apparatus;

Fig. 2, a detached view of a portion of the supporting-column, and the devices for holding and carrying the saw or knife blade. Fig. 3 represents a detached view, showing the rear of the swiveled yoke, which carries the arm carrying the emery-wheel, and the pulleys for transmitting motion to the same. Fig. 4 represents a sectional view through said yoke and the emery-wheel bar or arm, and Fig. 5 represents a detached view of the bar which carries the saw-disk of a circular saw.

The letter A represents a strong upright column, secured to a suitable base or bed plate, B, and supporting the cross heads or pieces 0 O, which, in turn, support the various working parts of the apparatus. The lower cross-piece G carries the driving-pulleys D D, mounted upon a shaft, E, journaled be tween arms E E, formed on said cross-piece for the purpose, and also the lower end of a vertical elevating-screw, F, the upper end of which is supported in the corresponding part of the cross-head 0. To the rear of said crosshead, directly over the pulleys D D, is swiveled a yoke, G, between the outer arms or branches H H of which is journaled a shaft, 1, carrying the pulleys K K, which transmit motion from the pulleys D D to the pulley L on the revolving shaft of the grindingwheel M. Said shaft I passes through two inner arms or branches, N N, of the yoke G, and through a metallic block, 0, adapted to fit loosely thereon, ground ofi or beveled to a point on its under side, forming a bearing for the point of an adjusting-screw, P, set through the rear of the yoke G, and bored in a line at right angles to the axis of the shaft 1, at the portion above said shaft, for the reception of the cylindrical portion of the arm R, which carries the grinding-wheel M, and which is capable of rotating therein, and of being fastened in any desired position by means of a setscrew, S. The emery-wheel M is mounted on a shaft journaled in the yoked portion of the front end of the arm R, the rear portion of the same being provided with a counter-balance, T. To the screw F is secured a stock, U, fitted loosely thereon, and capable of being elevated or lowered, and secured in position, by means of a set-screw, V, being supported from below by a hand wheel, W, which engages the threads of the screw, and can be elevated or depressed at pleasure. Said stock is provided with ways or guides for the saw-bar A, or carriage B for the knife or saw blade E said carriage being provided with clamps F or ways G for the purpose.

The operation of my invention is as follows The pulley D communicates, by means of a band, wit-ha suitable driving-pulley, and the pulley D with the pulley K above by a similar band, (shown in dotted lines.) The pulley K, on the opposite end of the same shaft, communicates by a band (also shown in dotted lines) with the pulley L on the shaft of the emery-wheel, transmitting the proper motion to the same. The saw-disk, in'case a circular saw is to be guinmed, is attached or pivoted to the end of the saw-bar A, (shown in Fig. 5,) and said saw-bar is properly adjusted and fastened in stock U, in such position as to bring the saw-teeth properly under the emerywheel. The stock is then adjusted so as to bring it to proper height by means of the elevating-screw, and the arm R is depressed in front until the wheel is in proper position, the said grinding-wheel being adjusted to the proper angle to the tooth by partially rotating the arm R in the block 0, and securing it when the grinding-wheel is brought to the proper inclination by means of the set-screw P. When the apparatus is tobe used to gum a straight-edged saw the blade is confined in the carriage B, and the emery-Wheel properly set in relation thereto, as above described,

and the saw gradually carried forward, as each successive tooth is to be gummed, by traversin g the carriage in the ways on the stock. When the apparatus is employed to grind the edges of planner or other knives the blade is mounted in the same manner as the sawblade just described; but the arm 0 and cariage B are set in such manner as to be near- 1y or parallel with each other, which is ac complished by turning the swiveled yoke in such manner as to give said arm a partial rotation in a horizontal plane, and carrying the carriage around tothe position shown in Fig. 1, until the two are in the proper relative positions, when the knife-edge can be traversed continually along the side or edge of the wheel, which can be set by rotating the' arm R at any angle in regard to said edge between a perpendicular and horizontal position.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. The combination of the cross-head G, swiveled yoke Gr, adjustable block 0, and arm R, carrying the emery-wheel M, all as and for I have hereunto set my hand this 29th day of April, 1875.

RANDOLPH DENSMORE. Witnesses:

O. L. EVERT, E. DENSMORE. 

